The Washer,key, cataloged under National Stock Number 5310-00-031-7765, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-031-7765 |
| Primary Part Number | 321499 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Internal Straight Key Width | 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 1.060 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.860 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN |
| Material Thickness | 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN |
| External Straight Key Width | 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN |
| External Key Quantity | 18 |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 302 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 0.060 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 321499 PRIMARY | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
NSN 5310-00-031-7765 is a Washer,key, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-031-7765 has 1 manufacturer part number on file: 321499 (Hamilton Sundstrand Corporation Dba Collins Aerospace).
2 possible matches (shared part number, not a government interchangeability claim): 4720-00-357-5088, 2995-01-212-9804. Verify interchangeability with system specifications before substitution.
Key specifications for 321499: Internal Straight Key Width: 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.235 INCHES MINIMUM AND 0.245 INCHES MAXIMUM IN; Overall Distance Including Keys: 1.060 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN; Style Designator: KEY. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.